Wyndham Championship leaderboard

Jason Dufner, Harris English and Sweden's Carl Pettersson, who fired a 62 in the first round and is a member at the club, are a further shot adrift.

Dufner, a 35-year-old from Ohio, produced the round of the day. His 63 included birdies at the first, third, fifth, eighth, 15th, 16th and 18th holes.

Overnight leader Jimmy Walker slipped out of contention with a 71, joining fellow Americans Davis Love and Matt Every on 11 under - three shots off the lead.

A 71 did US Open winner Webb Simpson's hopes no favours either, leaving him a shot further back alongside six others.

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Belgium's Nicolas Colsaerts was two shots further back after a 69, while England's Gary Christian moved into a share of 33rd place after a third round 67 which left him on six under. Scotland's Russell Knox was a shot further back after a 69.

However, Paul Casey endured an erratic round which left him two shots adrift of the field on five under par. The Englishman signed for a 77 which contained just five pars.

Birdies at the first, third, sixth, eighth and ninth holes were interspersed with a double bogey at the second, triple bogey at the fourth and quadruple bogey at the following hole.

Although the 35-year-old showed more consistency on the back nine, at five over par his challenge was over.